As a massive search continues for a missing tourist submersible with five people on board near the Titanic wreck, US journalist Michael Guillen recounts his harrowing experience of being trapped in a similar vessel during a dive in the same spot back in 2000. "I was the first correspondent ever to report from the wreck of the Titanic. So, naturally, I was excited," Dr Guillen, who at the time was science editor at America's ABC network, told BBC Radio 4. He recollects that - together with diving partner Brian and Russian pilot Viktor - they went down in a small...